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BTUs are regularly used to measure the size of air conditioning units, and the size determines how much heat the unit can remove from a room per hour. A unit that is undersized for the room will run non-stop and will not adequately cool the room. A unit that is oversized for the room will turn off too quickly, without properly removing the humidity. The following list offers a general guideline of the size to choose for the room:

150 square feet - up to 5,400

200 square feet - 6,000

340 square feet - 8,000

400 square feet - 9,000

450 square feet - 10,000

550 square feet - 12,000

750 square feet - 14,500

850 square feet - 16,000

1,000 square feet - 18,000

1,400 square feet - 24,000

1,520 square feet - 28,500

1,600 square feet - 32,000

The above recommended sizes are based on average climates and rooms. It is recommended to add 4,000 BTUs for kitchens, 10 percent for high ceilings and 10 to 20 percent for warmer climates. It is best to consult a professional for questions regarding sizing to ensure the unit is properly sized for the space.